Many studies mention the risks involved in eating a standard diet, which includes not only meat, but 'processed' meat, high dietary fat of the kind we don't want, and dietary cholesterol.

Here's another study suggesting that it isn't only the 'processing' of animal products that are linked to increased cancer risk in omnivores, it's - among other things - the cholesterol itself:

High Dietary Fat, Cholesterol Linked to Increased Risk of Breast Cancer

More about vegan food and cholesterol here: